Answer:
a. 144 ft
b. 5 s
Step-by-step explanation:
h = -16t² + 64t + 80
a. This is a parabola, so the maximum height is at the vertex.
t = -64 / (2 × -16)
t = 2
h = -16(2)² + 64(2) + 80
h = 144
The apple reaches a maximum height of 144 ft.
b. 0 = -16t² + 64t + 80
0 = t² − 4t − 5
0 = (t + 1) (t − 5)
t = -1 or 5
t must be positive, so it takes 5 seconds to reach the ground.
Answer:
2
Step-by-step explanation:
First plug in all the numbers into the variables.
3(2^2) - (18 - 4(2))/ 3^2 - 8
This is what your equation should look like after you plugged in 2 for the a and 3 for the b. Then you solve them individually; starting with 3(2^2). 2^2 is 4 and 3 × 4 is 12. So now the equation should look like this:
12 - (18 - 4(2))/ 3^2 - 8
Next, we can solve for (18 - 4(2)). So -4 × 2 is -8, and then you have (18 - 8). That answer would be 10. You should have 12 - 10 on top now, and the answer to that is just 2. Now your equation should look like this:
2/ 3^2 - 8
Now onto 3^2 - 8. 3^2 is 9 because that would just be 3 × 3. Now you have 9 - 8, which is 1. So now you should be left with:
2/1
And that's your final answer.
Answer:
150
Step-by-step explanation:
mark brainliest pls
Answer:
It is not enough evidence to reject null hypothesis. It is not enough evidence to say that mean score is not equal to 35.
Step-by-step explanation:
1. Null and alternative hypothesis
2. Significance level
Freedom degrees is given by:
For a sgnificance level of 0,01 and 22 freedom degrees, t-student distribution value is:
3. Test statistic
In this case, we have an one left tailed analysis, it means that null hypothesis is rejected if
Conclusion:
It is not enough evidence to reject null hypothesis. It is not enough evidence to say that mean score is not equal to 35.